Center screw in distributors comes loose. done this with 3 different units. on 1994 Nissan Sentra

center screw in distributor comes loose. done this with 3 different units. Does anyone know why, and how to permanately fix it?

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1 answer 1 comment
I would make sure to tighten it to the proper torque but before that, put a drop if lock-tight on the screw.
A+ Japanese Auto Repair, San Carlos CA 94070
Loctite (green!) has been used! It must be retightened about every 2 weeks!